For AstronomyDay, learn more about the 4.4-billion-year-old meteorite that has provided scientists with a trove of Red Planet revelations.
It was a tough fundraising pitch: Martin Bizzarro, a cosmochemist at the University of Copenhagen, needed some $500,000 to buy—and then grind up—material from one of the oldest and most valuable rocks in the world. Only this rock wasn't originally from Earth. It came from Mars."Black Beauty" meteorite
One of the most surprising findings: After Mars underwent a pummeling early in its life, all went quiet—even during a time, nearly 4 billion years ago, when our Solar System was thought to have suffered a cataclysmic assault. That's based on the ages of 51 zircon crystals found within the meteorite that likely formed under the extreme heat of an impact. The ages of the zircons largely cluster around 4.
Meanwhile, updated computer models suggested the migration of the giant planets to their present orbits, near the Solar System's start 4.56 billion years ago, triggering an early heavy bombardment that systematically declined from there. The idea is now further confirmed by the new study, says Desmond Moser, a geochronologist at Western University who was not involved in the work. The work, he says, paints"a compelling picture" of martian history.
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